A5014282666- Advanced ceramic materials synthesis
- Advanced materials and composites
- Metal and Thin Film Mechanics
- Ferroelectric and Piezoelectric Materials
- Microwave Dielectric Ceramics Synthesis
- Microwave-Assisted Synthesis and Applications
- Aluminum Alloys Composites Properties
- Additive Manufacturing and 3D Printing Technologies
- Intermetallics and Advanced Alloy Properties
- MXene and MAX Phase Materials
- Diamond and Carbon-based Materials Research
- Material Properties and Applications
- TiO2 Photocatalysis and Solar Cells
- Surface Treatment and Coatings
- Injection Molding Process and Properties
- Bone Tissue Engineering Materials
- Transition Metal Oxide Nanomaterials
- Advanced Surface Polishing Techniques
- Catalysis and Oxidation Reactions
- Multiferroics and related materials
- Laser Material Processing Techniques
- Catalytic Processes in Materials Science
- Laser-Ablation Synthesis of Nanoparticles
- Catalysis and Hydrodesulfurization Studies
- Molecular Junctions and Nanostructures
Frantsevich Institute for Problems in Materials Science
2015-2024
National Academy of Sciences of Ukraine
2012-2024
Institute of Software Systems
2024
National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute”
2020-2024
Kyiv National University of Technologies and Design
2019-2020
Fraunhofer Institute for Ceramic Technologies and Systems
2012
The experimental investigation of the rate-controlled synthesis and sintering barium titanate by different methods have been carried out. It is shown that permittivity depends on effective grain boundaries width, which consists physical boundary depolarization field area. width ceramics consolidation methods. polydomain structure with domain 10-12 nm discovered in nanocrystalline size 50-70 nm. generalized polymorphous phase diagram for pure proposed depending temperature.
A novel approach to pressureless sintering based on the combination of rapid‐rate sintering, rate‐controlled and two‐step under a controlled atmosphere is proposed. This combined method facilitates control grain pore morphology. The application this for pure nanocrystalline barium titanate powder enables suppression growth during intermediate final stages production fully dense ceramics with 108 nm size. factor 3.5, which three 17 times smaller than conventional respectively.
Ba0.85Ca0.15Zr0.10Ti0.90O3 (BCZT) relaxor ferroelectric ceramics exhibit enhanced energy storage and electrocaloric performances due to their excellent dielectric properties. In this study, the temperature-dependence of structural properties, as well field properties in BCZT elaborated at low-temperature hydrothermal processing are investigated. X-ray diffraction Raman spectroscopy results confirmed ferroelectric-paraelectric phase transition ceramic. At room temperature 1 kHz, constant loss...
This review is dedicated to the problems of nanostructured ceramics consolidation.Laboratory practice in recent years has displayed several potentially important technologies for consolidation ceramic nanopowders, such as spark plasma sintering, high pressure sintering and rate controlled sintering. The grain growth factor these processes was found be less than 10. These advanced have adapted nanopowders require specifically designed purposes. When techniques must accomplished rapid mode...
In the current investigation, a monolithic TiN and TiN-based nanocomposites, with addition of Al2O3 Y2O3, 5 wt% each, 20 TiB2 Si3N4 as additives respectively were developed using microwave energy at 0.9kW in ambient atmosphere ~ 1500 – 1530 ℃ without holding time. The sintered nanocomposites attained relative density ranging 87 93 %. XRD analyses confirmed that all compositions retained major phase good metallurgical bonding. Wear rate for nanocomposite oxide is lowest among composites owing...
We have studied peculiarities in the formation of single-crystalline barium titanate (BaTiO3) nanorods from a glycolate-mediated complex via single-step hydrothermal process under different supersaturation (SR) conditions. X-ray diffraction (XRD) showed pure BaTiO3 with an SR above 19. The tetragonality for (c/a) reached 1.013 at = 19–29 and dropped to 1.010 39. According transmission electron microscopy (TEM) XRD analyses, rod-shaped particles exhibited single crystallinity crystal growth...
Microwave sintering (MWS) of commercially available 15-nm-size nanocrystalline TiN powder was studied. Densification kinetics and grain growth mechanisms nano-TiN were evaluated using non-isothermal heating up to 1500 °C with variable rates. A true ceramic ~80-nm-size grains 94.5 % theoretical density obtained via MWS consolidation at 1400 °C. At higher temperatures, however, an uncontrolled a formation bimodal microstructure noticed. temperature dependence suggested boundary sliding as...
A modified superexchange model is used to clarify the physical mechanisms for formation of nonresonant tunneling conductance in terminated molecular wires. Due specific relationship between its key parameters, this has wider areas applicability compared flat-barrier and standard model, which are widely involved interpretation experimental results. Moreover, results obtained two latest models appear as characteristic limiting cases. Our estimates show that exponential decay conductance,...
The development of new materials for various fields science and technology has always been an important priority task scientists around the world. Recently, more interest in creation drawn to compounds based on perovskite phase with general formula ABO 3 . ability structure adapt different combinations chemical elements leads possibility creating physical characteristics. In present study, ordered a LaLuO perovskite-type was synthesized using mechanosynthesis technique. obtained material...